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LT1490A
(Rev.:RevB)

Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps

Linear Technology 

LT1490A/LT1491A

APPLICATIO S I FOR ATIO

Gain

The open-loop gain is almost independent of load when

the output is sourcing current. This optimizes performance

in single supply applications where the load is returned to

ground. The typical performance photo of Open-Loop

Gain for various loads shows the details.

TYPICAL APPLICATIO S

Square Wave Oscillator

5V

100k

100k

59k

+

1/2 LT1490A

–

R

50k

C

0.1µF

1490A TA02

VOUT

f= 1

2RC

VOUT = 5VP-P WITH 5V SUPPLY

IS = 200µA

AT VS = 5V, R = 50k, C = 1nF

OUTPUT IS 5kHz SLEW LIMITED TRIANGLE WAVE

Optional Output Compensation for

Capacitive Loads Greater Than 200pF

VIN

+

1/2 LT1490A

–

CL ≤ 10,000pF

0.22µF

150Ω

1490A TA04

W

W

SI PLIFIED SCHE ATIC

Q1

R1

30k

R2

1k

Q4 – IN

+

2µA

R3

1k

+ IN

Q2

D1

D2

Q7 Q8

Q11 Q12

Q9

Q10

Q13

Q3

D3

V+

Q22

Q15

Q14

Q19

Q17

Q20

OUT

Q16 Q18

Q21

Q5

Q6

ONE AMPLIFIER

D4 D5

R4

R5

40k

40k

V–

1490A SS

sn1490, 14901afbs

11

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